注释
<!-- -->
一些放置的eg
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> aaaaaaaa </title>
<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<!--一个注释针对IE8之前的版本-->
<script> document.createElement("myHero") </script>
<style>
myHero {
display: block;
background-color: lightblue;
padding: 30px;
font-size: 20px;
}
</style>
</head>
<body>
<h1>我的第一个标题</h1>
<article>woooooo</article>
<p>我的第一个段落。</p>
<div>
<myHero>我的第一个新元素</myHero>
</div>
<div>
<input list="browsers">
<datalist id="browsers">
<option value="Internet Explorer">
<option value="Firefox">
<option value="Chrome">
<option value="Opera">
<option value="Safari">
</datalist>
</div>
<div>
<canvas id="myCanvas"></canvas>
<script type="text/javascript">
var canvas=document.getElementById('myCanvas');
var ctx=canvas.getContext('2d');
ctx.fillStyle='#FF0000';
ctx.fillRect(0,0,100,100);
</script>
</div>
<div>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="190">
<polygon points="100,10 40,180 190,60 10,60 160,180"
style="fill:lime;stroke:purple;stroke-width:5;fill-rule:evenodd;">
</svg>
</div>
<div>
<canvas id="myCanvas" width="100" height="100"
style="border:1px solid #000000;">
</canvas>
</div>
<div>
<audio controls>
<source src="audio.ogg" type="audio/ogg">
<source src="audio.mp3" type="audio/mpeg">
</audio>
</div>
<div>
<video width="320" height="240" controls>
<source src="movie.mp4" type="video/mp4">
<source src="movie.ogg" type="video/ogg">
</video>
<video width="320" height="240" controls="controls">
<source src="movie.mp4" type="video/mp4" />
<source src="movie.ogg" type="video/ogg" />
<source src="movie.webm" type="video/webm" />
<object data="movie.mp4" width="320" height="240">
<embed src="movie.swf" width="320" height="240" />
</object>
</video>
</div>>
<div>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
<msup><mi>a</mi><mn>2</mn></msup>
<mo>+</mo>
<msup><mi>b</mi><mn>2</mn></msup>
<mo>=</mo>
<msup><mi>c</mi><mn>2</mn></msup>
</mrow>
</math>
</div>
</body>
</html>
checkbox
默认为不选
想默认选上：
<input type="checkbox" value="yes"/>
有时候无效，那么——
<input type="checkbox" checked/>
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